interface.c

ifconfig源码

    if ((slash = strchr(adr, '/')) == NULL)
	return 0;

    *slash++ = '\0';
    prefix = strtoul(slash, &end, 0);
    if (*end != '\0')
	return -1;

    if (name) {
	sprintf(name, "/%d", prefix);
    }
    mask->sin_family = AF_INET;
    mask->sin_addr.s_addr = htonl(~(0xffffffffU >> prefix));
    return 1;
}
#endif /* KEEP_UNUSED */

static struct aftype inet_aftype =
{
    "inet", "DARPA Internet", AF_INET, sizeof(unsigned long),
    NULL /* UNUSED INET_print */, INET_sprint,
	NULL /* UNUSED INET_input */, NULL /* UNUSED INET_reserror */,
    NULL /*INET_rprint */ , NULL /*INET_rinput */ ,
    NULL /* UNUSED INET_getnetmask */,
    -1,
    NULL
};

#endif				/* HAVE_AFINET */

/* Display an UNSPEC address. */
static char *UNSPEC_print(unsigned char *ptr)
{
    static char buff[64];
    char *pos;
    unsigned int i;

    pos = buff;
    for (i = 0; i < sizeof(struct sockaddr); i++) {
	pos += sprintf(pos, "%02X-", (*ptr++ & 0377));
    }
    buff[strlen(buff) - 1] = '\0';
    return (buff);
}

/* Display an UNSPEC socket address. */
static char *UNSPEC_sprint(struct sockaddr *sap, int numeric)
{
    static char buf[64];

    if (sap->sa_family == 0xFFFF || sap->sa_family == 0)
	return safe_strncpy(buf, _("[NONE SET]"), sizeof(buf));
    return (UNSPEC_print(sap->sa_data));
}

static struct aftype unspec_aftype =
{
    "unspec", "UNSPEC", AF_UNSPEC, 0,
    UNSPEC_print, UNSPEC_sprint, NULL, NULL,
    NULL,
};

static struct aftype *aftypes[] =
{
#if HAVE_AFUNIX
    &unix_aftype,
#endif
#if HAVE_AFINET
    &inet_aftype,
#endif
#if HAVE_AFINET6
    &inet6_aftype,
#endif
#if HAVE_AFAX25
    &ax25_aftype,
#endif
#if HAVE_AFNETROM
    &netrom_aftype,
#endif
#if HAVE_AFROSE
    &rose_aftype,
#endif
#if HAVE_AFIPX
    &ipx_aftype,
#endif
#if HAVE_AFATALK
    &ddp_aftype,
#endif
#if HAVE_AFECONET
    &ec_aftype,
#endif
#if HAVE_AFASH
    &ash_aftype,
#endif
#if HAVE_AFX25
    &x25_aftype,
#endif
    &unspec_aftype,
    NULL
};

#ifdef KEEP_UNUSED
static short sVafinit = 0;

static void afinit()
{
    unspec_aftype.title = _("UNSPEC");
#if HAVE_AFUNIX
    unix_aftype.title = _("UNIX Domain");
#endif
#if HAVE_AFINET
    inet_aftype.title = _("DARPA Internet");
#endif
#if HAVE_AFINET6
    inet6_aftype.title = _("IPv6");
#endif
#if HAVE_AFAX25
    ax25_aftype.title = _("AMPR AX.25");
#endif
#if HAVE_AFNETROM
    netrom_aftype.title = _("AMPR NET/ROM");
#endif
#if HAVE_AFIPX
    ipx_aftype.title = _("Novell IPX");
#endif
#if HAVE_AFATALK
    ddp_aftype.title = _("Appletalk DDP");
#endif
#if HAVE_AFECONET
    ec_aftype.title = _("Econet");
#endif
#if HAVE_AFX25
    x25_aftype.title = _("CCITT X.25");
#endif
#if HAVE_AFROSE
    rose_aftype.title = _("AMPR ROSE");
#endif
#if HAVE_AFASH
    ash_aftype.title = _("Ash");
#endif	
    sVafinit = 1;
}

static int aftrans_opt(const char *arg)
{
    struct aftrans_t *paft;
    char *tmp1, *tmp2;
    char buf[256];

    safe_strncpy(buf, arg, sizeof(buf));

    tmp1 = buf;

    while (tmp1) {

	tmp2 = index(tmp1, ',');

	if (tmp2)
	    *(tmp2++) = '\0';

	paft = aftrans;
	for (paft = aftrans; paft->alias; paft++) {
	    if (strcmp(tmp1, paft->alias))
		continue;
	    if (strlen(paft->name) + strlen(afname) + 1 >= sizeof(afname)) {
		fprintf(stderr, _("Too much address family arguments.\n"));
		return (0);
	    }
	    if (paft->flag)
		(*paft->flag)++;
	    if (afname[0])
		strcat(afname, ",");
	    strcat(afname, paft->name);
	    break;
	}
	if (!paft->alias) {
	    fprintf(stderr, _("Unknown address family `%s'.\n"), tmp1);
	    return (1);
	}
	tmp1 = tmp2;
    }

    return (0);
}

/* set the default AF list from the program name or a constant value    */
static void aftrans_def(char *tool, char *argv0, char *dflt)
{
    char *tmp;
    char *buf;

    strcpy(afname, dflt);

    if (!(tmp = strrchr(argv0, '/')))
	tmp = argv0;		/* no slash?! */
    else
	tmp++;

    if (!(buf = strdup(tmp)))
	return;

    if (strlen(tool) >= strlen(tmp)) {
	free(buf);
	return;
    }
    tmp = buf + (strlen(tmp) - strlen(tool));

    if (strcmp(tmp, tool) != 0) {
	free(buf);
	return;
    }
    *tmp = '\0';
    if ((tmp = strchr(buf, '_')))
	*tmp = '\0';

    afname[0] = '\0';
    if (aftrans_opt(buf))
	strcpy(afname, buf);

    free(buf);
}

/* Check our protocol family table for this family. */
static struct aftype *get_aftype(const char *name)
{
    struct aftype **afp;

#ifdef KEEP_UNUSED
    if (!sVafinit)
	afinit();
#endif /* KEEP_UNUSED */

    afp = aftypes;
    while (*afp != NULL) {
	if (!strcmp((*afp)->name, name))
	    return (*afp);
	afp++;
    }
    if (index(name, ','))
	fprintf(stderr, _("Please don't supply more than one address family.\n"));
    return (NULL);
}
#endif /* KEEP_UNUSED */

/* Check our protocol family table for this family. */
static struct aftype *get_afntype(int af)
{
    struct aftype **afp;

#ifdef KEEP_UNUSED
    if (!sVafinit)
	afinit();
#endif /* KEEP_UNUSED */

    afp = aftypes;
    while (*afp != NULL) {
	if ((*afp)->af == af)
	    return (*afp);
	afp++;
    }
    return (NULL);
}

/* Check our protocol family table for this family and return its socket */
static int get_socket_for_af(int af)
{
    struct aftype **afp;

#ifdef KEEP_UNUSED
    if (!sVafinit)
	afinit();
#endif /* KEEP_UNUSED */

    afp = aftypes;
    while (*afp != NULL) {
	if ((*afp)->af == af)
	    return (*afp)->fd;
	afp++;
    }
    return -1;
}

#ifdef KEEP_UNUSED
/* type: 0=all, 1=getroute */
static void print_aflist(int type) {
    int count = 0;
    char * txt;
    struct aftype **afp;

#ifdef KEEP_UNUSED
    if (!sVafinit)
	afinit();
#endif /* KEEP_UNUSED */

    afp = aftypes;
    while (*afp != NULL) {
	if ((type == 1 && ((*afp)->rprint == NULL)) || ((*afp)->af == 0)) {
		afp++; continue;
	}
	if ((count % 3) == 0) fprintf(stderr,count?"\n    ":"    "); 
        txt = (*afp)->name; if (!txt) txt = "..";
	fprintf(stderr,"%s (%s) ",txt,_((*afp)->title));
	count++;
	afp++;
    }
    fprintf(stderr,"\n");
}
#endif /* KEEP_UNUSED */

struct user_net_device_stats {
    unsigned long long rx_packets;	/* total packets received       */
    unsigned long long tx_packets;	/* total packets transmitted    */
    unsigned long long rx_bytes;	/* total bytes received         */
    unsigned long long tx_bytes;	/* total bytes transmitted      */
    unsigned long rx_errors;	/* bad packets received         */
    unsigned long tx_errors;	/* packet transmit problems     */
    unsigned long rx_dropped;	/* no space in linux buffers    */
    unsigned long tx_dropped;	/* no space available in linux  */
    unsigned long rx_multicast;	/* multicast packets received   */
    unsigned long rx_compressed;
    unsigned long tx_compressed;
    unsigned long collisions;

    /* detailed rx_errors: */
    unsigned long rx_length_errors;
    unsigned long rx_over_errors;	/* receiver ring buff overflow  */
    unsigned long rx_crc_errors;	/* recved pkt with crc error    */
    unsigned long rx_frame_errors;	/* recv'd frame alignment error */
    unsigned long rx_fifo_errors;	/* recv'r fifo overrun          */
    unsigned long rx_missed_errors;	/* receiver missed packet     */
    /* detailed tx_errors */
    unsigned long tx_aborted_errors;
    unsigned long tx_carrier_errors;
    unsigned long tx_fifo_errors;
    unsigned long tx_heartbeat_errors;
    unsigned long tx_window_errors;
};

struct interface {
    struct interface *next, *prev; 
    char name[IFNAMSIZ];	/* interface name        */
    short type;			/* if type               */
    short flags;		/* various flags         */
    int metric;			/* routing metric        */
    int mtu;			/* MTU value             */
    int tx_queue_len;		/* transmit queue length */
    struct ifmap map;		/* hardware setup        */
    struct sockaddr addr;	/* IP address            */
    struct sockaddr dstaddr;	/* P-P IP address        */
    struct sockaddr broadaddr;	/* IP broadcast address  */
    struct sockaddr netmask;	/* IP network mask       */
    struct sockaddr ipxaddr_bb;	/* IPX network address   */
    struct sockaddr ipxaddr_sn;	/* IPX network address   */
    struct sockaddr ipxaddr_e3;	/* IPX network address   */
    struct sockaddr ipxaddr_e2;	/* IPX network address   */
    struct sockaddr ddpaddr;	/* Appletalk DDP address */
    struct sockaddr ecaddr;	/* Econet address        */
    int has_ip;
    int has_ipx_bb;
    int has_ipx_sn;
    int has_ipx_e3;
    int has_ipx_e2;
    int has_ax25;
    int has_ddp;
    int has_econet;
    char hwaddr[32];		/* HW address            */
    int statistics_valid;
    struct user_net_device_stats stats;		/* statistics            */
    int keepalive;		/* keepalive value for SLIP */
    int outfill;		/* outfill value for SLIP */
};


int interface_opt_a = 0;		/* show all interfaces          */

#ifdef KEEP_UNUSED
static int opt_i = 0;			/* show the statistics          */
static int opt_v = 0;			/* debugging output flag        */

static int addr_family = 0;		/* currently selected AF        */
#endif /* KEEP_UNUSED */

static struct interface *int_list, *int_last;
static int skfd = -1;			/* generic raw socket desc.     */


static int sockets_open(int family)
{
    struct aftype **aft;
    int sfd = -1;
    static int force = -1;

    if (force < 0) {
	force = 0;
	if (get_kernel_revision() < KRELEASE(2, 1, 0))
	    force = 1;
	if (access("/proc/net", R_OK))
	    force = 1;
    }
    for (aft = aftypes; *aft; aft++) {
	struct aftype *af = *aft;
	int type = SOCK_DGRAM;
	if (af->af == AF_UNSPEC)
	    continue;
	if (family && family != af->af)
	    continue;
	if (af->fd != -1) {
	    sfd = af->fd;
	    continue;
	}
	/* Check some /proc file first to not stress kmod */
	if (!family && !force && af->flag_file) {
	    if (access(af->flag_file, R_OK))
		continue;
	}
#if HAVE_AFNETROM
	if (af->af == AF_NETROM)
	    type = SOCK_SEQPACKET;
#endif
#if HAVE_AFX25
       if (af->af == AF_X25)
           type = SOCK_SEQPACKET;
#endif
	af->fd = socket(af->af, type, 0);
	if (af->fd >= 0)
	    sfd = af->fd;
    }
    if (sfd < 0)
	fprintf(stderr, _("No usable address families found.\n"));
    return sfd;
}

/* like strcmp(), but knows about numbers */
static int nstrcmp(const char *astr, const char *b)
{
    const char *a = astr;

    while (*a == *b) {
	if (*a == '\0')
	    return 0;
	a++;
	b++;
    }
    if (isdigit(*a)) {
	if (!isdigit(*b))
	    return -1;
	while (a > astr) {
	    a--;
	    if (!isdigit(*a)) {
		a++;
		break;
	    }
	    if (!isdigit(*b))
		return -1;
	    b--;
	}
	return atoi(a) > atoi(b) ? 1 : -1;
    }
    return *a - *b;
}

static struct interface *add_interface(char *name)
{
    struct interface *ife, **nextp, *new;

    for (ife = int_last; ife; ife = ife->prev) {
	    int n = nstrcmp(ife->name, name); 
	    if (n == 0) 
		    return ife; 
	    if (n < 0) 
		    break; 
    }
    new(new); 
    safe_strncpy(new->name, name, IFNAMSIZ); 
    nextp = ife ? &ife->next : &int_list;
    new->prev = ife;
    new->next = *nextp; 
    if (new->next) 
	    new->next->prev = new; 
    else
	    int_last = new; 
    *nextp = new; 
    return new; 
}


static int if_readconf(void)
{
    int numreqs = 30;
    struct ifconf ifc;
    struct ifreq *ifr;
    int n, err = -1;
    int skfd;

    /* SIOCGIFCONF currently seems to only work properly on AF_INET sockets
       (as of 2.1.128) */ 
    skfd = get_socket_for_af(AF_INET);
    if (skfd < 0) {
	fprintf(stderr, _("warning: no inet socket available: %s\n"),
		strerror(errno));
	/* Try to soldier on with whatever socket we can get hold of.  */
	skfd = sockets_open(0);
	if (skfd < 0)
	    return -1;
    }

    ifc.ifc_buf = NULL;
    for (;;) {
	ifc.ifc_len = sizeof(struct ifreq) * numreqs;
	ifc.ifc_buf = xrealloc(ifc.ifc_buf, ifc.ifc_len);

	if (ioctl(skfd, SIOCGIFCONF, &ifc) < 0) {
	    perror("SIOCGIFCONF");
	    goto out;
	}
	if (ifc.ifc_len == sizeof(struct ifreq) * numreqs) {
	    /* assume it overflowed and try again */
	    numreqs += 10;
	    continue;
	}
	break;
    }

    ifr = ifc.ifc_req;